<!DOCTYPE html>
<html>

<script id="vertex-shader" type="x-shader/x-vertex">

attribute vec2 vPosition;
attribute  vec2 vTexCoord;
varying vec2 fTexCoord;

void
main()
{    
    fTexCoord = vTexCoord;
    gl_Position =  vec4(vPosition.x, vPosition.y, 0.0, 1.0);
}
</script>

<script id="fragment-shader" type="x-shader/x-fragment">

precision mediump float;

varying vec2 fTexCoord;
uniform sampler2D texture;

void
main()
{
    vec4 color = texture2D(texture, fTexCoord);
    if(color.g<0.5) color.g = 2.0*color.g;
        else color.g = 2.0 - 2.0*color.g;
    color.b = 1.0-color.b;
    gl_FragColor = color;
    
}
</script>


<script type="text/javascript" src="../Common/webgl-utils.js"></script>
<script type="text/javascript" src="../Common/initShaders.js"></script>
<script type="text/javascript" src="../Common/MV.js"></script>
<script type="text/javascript" src="hatImage1.js"></script>

<body>
<canvas id="gl-canvas" width="1024" height="1024">
Oops ... your browser doesn't support the HTML5 canvas element
</canvas>
</body>
</html>
